[BUG]

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

What's wrong?

Claude Code segfaults immediately on startup (claude, claude --version) across
multiple versions (tested 2.1.139, 2.1.200, 2.1.246 — all segfault identically).
This looks like the same class of bug as #76241, but on a newer glibc than
previously reported there.

Environment

• OS: Arch Linux (rolling release, fully updated)
• glibc: 2.44 (ldd --version)
• Kernel/arch: x86_64
• CPU: AVX + AVX2 present (confirmed via /proc/cpuinfo)
• Node: v22.22.2 installed separately (irrelevant — Claude Code bundles its own Bun runtime)
• Install method: npm (npm install -g @anthropic-ai/claude-code), also tried with

--allow-scripts to ensure postinstall ran

Related

https://github.com/anthropics/claude-code/issues/76241

What Should Happen?

Expected behavior

Claude Code should run normally, or at minimum fail with a readable error instead
of a raw SIGSEGV, on systems with a newer glibc than the bundled Bun binary expects.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce

1. npm install -g @anthropic-ai/claude-code
2. Run claude
3. Immediate SIGSEGV (Address boundary error), no output printed

What I've ruled out

• Not an install-scripts/postinstall issue (reproduces with scripts explicitly allowed)
• Not a Node version/arch mismatch (system Node runs fine independently)
• Not an AVX-support issue (CPU has AVX2; this isn't the "CPU lacks AVX" crash)
• Not version-specific — segfaults on 2.1.139, 2.1.200, and latest (2.1.246)

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.246

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Other

Additional Information

_No response_